32 lines
855 B
Markdown
32 lines
855 B
Markdown
# 如何在 Python 中导入模块
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> 原文：<https://www.pythonforbeginners.com/basics/python-importing-modules>
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### 模块
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Python 模块使得编程更加容易。
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它基本上是一个由已经编写好代码组成的文件。
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当 Python 导入一个模块时，它首先检查模块注册表(sys.modules)
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以查看该模块是否已经被导入。
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如果是这种情况，Python 将使用现有的模块对象。
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### 导入模块
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导入模块有不同的方法
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```py
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import sys
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# access module, after this you can use sys.name to refer to
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# things defined in module sys.
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from sys import stdout
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# access module without qualifying name.
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# This reads >> from the module "sys" import "stdout", so that
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# we would be able to refer "stdout" in our program.
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from sys import *
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# access all functions/classes in the sys module.
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``` |